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(Color online) Contour plot of the PES for In adatom adsorption on repeated 2 × 2 cells on the m-plane (a) and a-plane (b) surfaces. Two surface layers are also superposed: the outmost In-N dimers parallel to c-axis are printed with larger round shapes than In-N dimers underneath. m1 and m2 denote minimum energy sites, while t1, t2, t3, t4 label saddle points. Minimum energy diffusion paths are indicated by white dotted lines. Black color in the PESs indicates the zero of energy, and each contour line corresponds to an energy interval of 0.03 eV (a) and 0.06 eV (b). The surface unit cell is represented by a white dashed rectangle.
In adatom diffusion energy barriers Ediff (eV) on both nonpolar InN surfaces for migration paths parallel and normal to the c-axis. In the last three columns, axial over lateral diffusion lengths for typical InN NWs MBE growth temperatures are reported.
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